AMD Radeon HD 8970M 's Advantages
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (153.6GB/s vs 14.40GB/s)
960 additional rendering cores
AMD Radeon R5 M330 's Advantages
Released 2 years late
Boost Clock has increased by 14% (1030MHz vs 900MHz)
Lower TDP (18W vs 100W)